目前,世界各国的电力机车在结构上都是四轴和六轴机车。与四轴机车相比,六轴机车的功率可增大一半,这有利于提高列车的运行速度,增加列车重量和适宜于山区长大坡道运行,因而更受到各国的重视和采用。六轴电力机车的轴式不外乎CC(两台三轴转向架)和BBB(三台两轴转向架)两种。目前各国偏向不一,意大利、日本等国基本上采用BBB轴式,瑞士从原来的CC轴 At present, the electric locomotives of various countries in the world are all four-axis and six-axis locomotives in structure. Compared with four-axis locomotive, six-axis locomotive power can be increased by half, which is conducive to improving the speed of the train, increasing train weight and suitable for mountain uphill operation, and thus more countries have taken the attention and adoption. Axle six-axis electric locomotive nothing more than CC (two three-axle bogies) and BBB (three two-axle bogies) two. At present, different countries tend to be different, Italy, Japan and other countries basically use BBB axis, Switzerland from the original CC axis